How is the heart-lung machine put into effect during an open heart surgery?

During an open heart surgery, does the heart stop before they put the heart lung machine or they put it while the heart is beating? And also, how do they stop the heart?

when my son was having his open heart surgery, they put him to sleep, put him on a vent and then they opened his chest, and cooled off his body and cooled of his heart. once cold the heart beats slowly and they can insert the heart lung machine and then let that take over the function of pumping the blood and circulating it back in the body bipasing the heart so the heart doesn't have to pump.

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